<?php 
define('GOOGLE_MAGIC', 0xE6359A60); 

class pageRank{

	var $pr; 

	var $rank; 

	function zeroFill($a, $b){ 
		
		$z = hexdec(80000000);

		if ($z & $a){ 
			$a = ($a>>1); 
			$a &= (~$z); 
			$a |= 0x40000000; 
			$a = ($a>>($b-1)); 
		}else{ 
			$a = ($a>>$b); 
		}

		return $a; 
	} 

	function mix($a,$b,$c) { 

		$a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,13));
		$b -= $c; $b -= $a; $b ^= ($a<<8);
		$c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,13));
		$a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,12));
		$b -= $c; $b -= $a; $b ^= ($a<<16);
		$c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,5));
		$a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,3));
		$b -= $c; $b -= $a; $b ^= ($a<<10);
		$c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,15));
		return array($a,$b,$c); 
	} 

	function GoogleCH($url, $length=null, $init=GOOGLE_MAGIC) { 
		if(is_null($length)) { 
			$length = sizeof($url); 
		} 

		$a = $b = 0x9E3779B9;
		$c = $init;
		$k = 0;
		$len = $length;

		while($len >= 12) { 
			$a += ($url[$k+0] +($url[$k+1]<<8) +($url[$k+2]<<16) +($url[$k+3]<<24));
			$b += ($url[$k+4] +($url[$k+5]<<8) +($url[$k+6]<<16) +($url[$k+7]<<24));
			$c += ($url[$k+8] +($url[$k+9]<<8) +($url[$k+10]<<16)+($url[$k+11]<<24));
			$mix = $this->mix($a,$b,$c);
			$a = $mix[0]; $b = $mix[1]; $c = $mix[2];
			$k += 12;
			$len -= 12; 
		}

		$c += $length;

		switch($len){ 
			case 11: $c+=($url[$k+10]<<24);
			case 10: $c+=($url[$k+9]<<16);
			case 9 : $c+=($url[$k+8]<<8);
			/* the first byte of c is reserved for the length */
			case 8 : $b+=($url[$k+7]<<24);
			case 7 : $b+=($url[$k+6]<<16);
			case 6 : $b+=($url[$k+5]<<8);
			case 5 : $b+=($url[$k+4]);
			case 4 : $a+=($url[$k+3]<<24);
			case 3 : $a+=($url[$k+2]<<16);
			case 2 : $a+=($url[$k+1]<<8);
			case 1 : $a+=($url[$k+0]); 
		} 

		$mix = $this->mix($a,$b,$c); 
		/* report the result */ 
		return $mix[2]; 
	} 

	//converts a string into an array of integers containing the numeric value of the char 

	function strord($string) { 

		for($i=0;$i<strlen($string);$i++) { 
			$result[$i] = ord($string{$i}); 
		} 
		return $result; 
	} 

	function printrank($url){

		$ch = "6".$this->GoogleCH($this->strord("info:" . $url)); 

		$fp = fsockopen("www.google.com", 80, $errno, $errstr, 30);
		if (!$fp) {
			echo "$errstr ($errno)<br />\n";
		} else {

			$out = "GET /search?client=navclient-auto&ch=" . $ch .  "&features=Rank&q=info:" . $url . " HTTP/1.1\r\n" ;
			$out .= "Host: www.google.com\r\n" ;
			$out .= "Connection: Close\r\n\r\n" ;
			
			fwrite($fp, $out);

			while (!feof($fp)) {

				$data = fgets($fp, 128);
				$pos = strpos($data, "Rank_");

				if($pos === false){
				}else{
					$pagerank = substr($data, $pos + 9);
					$this->rank = $pagerank;
					$this->pr_image($pagerank);
				}
			}
			fclose($fp); 
		}
	}

	function pr_image($pagerank){

		if($pagerank == 0 || $pagerank == ''){
		$this->pr = "<img src=\"images/pr0.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}elseif($pagerank == 1){
		$this->pr = "<img src=\"images/pr1.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}elseif($pagerank == 2){
		$this->pr = "<img src=\"images/pr2.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}elseif($pagerank == 3){
		$this->pr = "<img src=\"images/pr3.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}elseif($pagerank == 4){
		$this->pr = "<img src=\"images/pr4.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}elseif($pagerank == 5){
		$this->pr = "<img src=\"images/pr5.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}elseif($pagerank == 6){
		$this->pr = "<img src=\"images/pr6.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}elseif($pagerank == 7){
		$this->pr = "<img src=\"images/pr7.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}elseif($pagerank == 8){
		$this->pr = "<img src=\"images/pr8.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}elseif($pagerank == 9){
		$this->pr = "<img src=\"images/pr9.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}else{
		$this->pr = "<img src=\"images/pr10.gif\" alt=\"PageRank " .$pagerank. " out of 10\">" ;
		}
	}

	function get_pr(){
		return $this->pr;
	}
	
	function get_rank(){
		return $this->rank;
	}
}

?>